JPH06273002A - Refrigeration cycle - Google Patents

Abstract

PURPOSE:To prevent the evaporation of a liquid refrigerant of a muffler effectively in a refrigeration cycle made up of a compressor, a condenser, the muffler, a drier, a choking device and an evaporator as connected in the order. CONSTITUTION:A muffler 13 and a drier 14 are arranged side by side. the lower part of the muffler 13 is connected to the upper part of the drier 14 with a connection pipe 17 and an outlet pipe 12a of a condenser is connected to the upper part of the muffler 13 while an inlet tube 15a of a capillary tube is connected to the lover part of the drier 14. When a compressor is stopped, a refrigerant is drawn to the side of an evaporator on the low pressure side and a gas refrigerant at the upper part of the connection pipe 17 flows to the drier 14 to lower the pressure of the upper gas refrigerant of the connection pipe 17. so that the liquid refrigerant stored at a lower part is evaporated. But as the diameter of the connection pipe 17 is relatively fine and the amount of heat exchanged with the outside air is limited with a smaller surface area thereof, the refrigerant is not gasified so much. Thus. the pressure in the muffler 3 is not lowered so much to keep the evaporation of the liquid limited in the muffler 13 thereby minimizing possible drop in the temperature to an extent of causing dew formation without heat insulation.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a refrigeration cycle,
Particularly, it relates to an improved muffler and dryer for the pipeline configuration.

[0002]

2. Description of the Related Art For example, a refrigerating cycle of a refrigerator comprises a compressor, a condenser, a muffler, a dryer, an expansion device and an evaporator, which are connected in this order. In this case, as shown in FIG. 4, the muffler 1 and the dryer 2 are
The muffler 1 and the dryer 2 are provided side by side in a machine room (not shown) formed outside the lower part of the heat insulating box which is the refrigerator main body, and the muffler 1 and the dryer 2 are both connected at the upper part by an inverted U-shaped connection pipe 3.

The outlet of the condenser 4 is the muffler 1
Capillary tube 5 that is connected to the bottom of the
Is connected to the lower part of the pipe dryer 2.
The muffler 1 is a condenser 4 when the compressor is stopped.
It is for eliminating the flow sound of the refrigerant flowing from the side toward the capillary tube 5, and the inside is empty. The dryer 2 is for removing water from the refrigerant, and is filled with a desiccant.

[0004]

When the compressor is stopped, the liquid refrigerant accumulates in the lower part of the muffler 1, but the dryer 2 is filled with the desiccant, so that the liquid refrigerant is hardly accumulated. Is in a state. On the other hand, when the compressor is stopped, the refrigerant is drawn to the evaporator side, which is the low pressure side, so that the gas refrigerant in the upper part of the muffler 1 flows from the connection pipe 3 to the dryer 2. Then, since the pressure of the upper gas refrigerant in the muffler 1 is reduced, the liquid refrigerant stored in the lower portion is evaporated and gasified. As a result,
In the muffler 1, many liquid refrigerants will be gasified.

As described above, when a large amount of the liquid refrigerant is evaporated in the muffler 1, the temperature of the muffler 1 is lowered, and as a result, dew is attached to the outer surface of the muffler 1. Further, the gas refrigerant evaporated in the muffler 1 flows into the dryer 2, then flows into the evaporator through the capillary tube 5, and is condensed and liquefied there. When the gas refrigerant is condensed by the evaporator, the evaporator heats up due to the heat of condensation, which causes a bad thermal effect on the inside of the refrigerator.

In order to solve such a problem, conventionally, the muffler 1 and the dryer 2 are sponged together with the idea that the heat exchange between the muffler 1 and the outside air is cut off to prevent the gasification of the liquid refrigerant as much as possible. It was wrapped in a band and stopped with a band, but not only the material cost and working cost were high, but it was hard to say that it was an effective solution for preventing gasification of the liquid refrigerant.

The present invention has been made in view of the above circumstances, and an object thereof is to effectively prevent evaporation of a liquid refrigerant in a muffler without using a means for interrupting heat exchange between the muffler and the outside air. To provide a refrigeration cycle that can.

[0008]

In order to solve the above-mentioned problems, the refrigeration cycle of the present invention is arranged such that the muffler and the dryer are arranged side by side and the lower part of the muffler and the upper part of the dryer are connected by a connecting pipe, The refrigerant is supplied to the muffler from the upper portion thereof, and the refrigerant supplied from the lower portion of the muffler to the dryer through the connection pipe is supplied from the lower portion of the dryer to the expansion device. To do.

[0009]

When the compressor is stopped, the liquid refrigerant is stored in the lower part of the muffler, and the liquid refrigerant having the same liquid level as the liquid refrigerant in the muffler is also stored in the connection pipe. On the other hand, when the compressor is stopped, the refrigerant is drawn to the evaporator side, which is the low pressure side, so that the gas refrigerant in the upper part of the connection pipe flows to the dryer. Then,
Since the pressure of the gas refrigerant in the upper part of the connection pipe drops, the liquid refrigerant stored in the lower part evaporates, but the connection pipe has a relatively small diameter and its surface area is small, so heat exchange with the outside air The amount is small and not so much refrigerant is gasified. At this time, since the pressure of the refrigerant in the muffler does not become so low, the evaporation amount of the liquid refrigerant in the muffler is small, and there is no risk of the temperature lowering to the extent that dew condensation occurs.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, in the refrigeration cycle shown in FIG. 2, the rotary compressor 1 is used as a compressor.
1 is used, and a condenser 12, a muffler 13, and a muffler 13 are provided between the discharge port 11a and the suction port 11b of the compressor 11.
The dryer 14, the capillary tube 15 as the expansion device, and the evaporator 16 are sequentially connected.

The muffler 13 and the dryer 14 are arranged side by side in a machine room (not shown) formed outside the lower part of the heat insulating box which is the main body of the refrigerator. Then, as shown in FIG. 1, the lower portion of the muffler 13 and the upper portion of the dryer 14 are connected by a substantially S-shaped connection pipe 17. The outlet pipe 12a of the condenser 12 is connected to the upper portion of the muffler 13, and the inlet tube 15a of the capillary tube 15 is connected to the lower portion of the dryer 14. Although the muffler 13 is empty, the dryer 14 is filled with a desiccant for removing water from the refrigerant.

In the above structure, when the compressor 11 is stopped, the liquid refrigerant is stored in the lower portion of the muffler 13, and the liquid refrigerant having the same liquid level as the liquid refrigerant in the muffler 13 is also stored in the connection pipe 17. It will be in a state of being. Since the dryer 14 is filled with a desiccant, almost no liquid refrigerant is stored.

On the other hand, when the compressor 11 is stopped, the refrigerant is drawn to the evaporator 16 side which is the low pressure side.
The gas refrigerant in the upper part of the connection pipe 17 is sucked into the dryer 14 side. Then, the pressure of the gas refrigerant in the upper part of the connection pipe 17 decreases, and the liquid refrigerant stored in the lower part of the connection pipe 17 evaporates. However, since the connection pipe 17 has a relatively small diameter and a small surface area, the amount of heat exchange with the outside air is small, and a large amount of the refrigerant is not gasified.

At this time, since a small amount of liquid refrigerant also exists in the dryer 14, the liquid refrigerant also evaporates and gasifies, and is cooled through the capillary tube 15 together with the gas refrigerant evaporated in the connection pipe 17. Flows into the vessel 16.

By the way, when the liquid refrigerant evaporates to some extent in the connection pipe 17, the liquid level in the muffler 13 lowers,
As a result, the pressure of the gas refrigerant in the upper part of the muffler 13 is also lowered to some extent, but the degree of the pressure drop is extremely reduced.
Therefore, even if the liquid refrigerant evaporates and gasifies in the muffler 13, the amount thereof becomes extremely small, and the surface temperature of the muffler 13 is not likely to be lowered to cause dew. In addition, as described above, the dryer 14 and the connecting pipe 17
Since the amount of liquid refrigerant that evaporates in the
Also, the surface temperature of the connecting pipe 17 does not decrease to the extent that dew condensation occurs.

Furthermore, the dryer 14 and the connecting pipe 1
Since the amount of liquid refrigerant evaporated in 7 is small, the amount of gas refrigerant flowing into the evaporator 16 is naturally small, and as a result, the amount of heat released by condensation of the gas refrigerant in the evaporator 16 is small, The thermal effect on the inside of the refrigerator is very small.

FIG. 3 shows the operation of the compressor (D period) and the stop (E) between the case of the present invention and the conventional case shown in FIG.
The experimental result which measured the temperature change of the dryer and the evaporator with the period) is shown. In the figure, the solid line shows the case of the present application, and the chain double-dashed line shows the case of the conventional case. As will be understood from this, in the conventional case, the temperature of the dryer was lowered to about 0 ° C. when the compressor was stopped. Then 3
The temperature of the evaporator rises to about −12 ° C. when the compressor is stopped in the past, but the temperature rises only to about −17 ° C. in the present application, and the gas refrigerant evaporation suppression effect according to the present application is high. Be understood.

The present invention is not limited to the embodiments described above and shown in the drawings. For example, the present invention is not limited to the refrigerating cycle of a refrigerator but may be applied to a refrigerating cycle mounted in a vending machine. Various modifications can be made without departing from the spirit of the invention.

[0019]

As described above, according to the present invention, the lower part of the muffler and the upper part of the dryer are connected by the connecting pipe, and the refrigerant from the condenser is supplied to the muffler from the upper part thereof and from the lower part of the muffler. The refrigerant supplied from the upper part to the dryer via the connection pipe is supplied to the expansion device from the lower part of the dryer, so that the muffler and the dryer are wrapped with a heat insulating material without interrupting the heat exchange with the outside air. In addition, the evaporation of the liquid refrigerant in the muffler can be suppressed as much as possible, and the amount of the gas refrigerant flowing into the evaporator can be reduced, and the temperature rise of the evaporator due to the condensation of the gas refrigerant can be prevented as much as possible. Is something that can be done.

[Brief description of drawings]

FIG. 1 is a front view of a main part showing an embodiment of the present invention.

FIG. 2 Refrigeration cycle configuration diagram

FIG. 3 is a diagram showing temperature changes of a muffler and an evaporator due to operation and stop of a compressor, in comparison with those of a conventional configuration.

FIG. 4 is a diagram corresponding to FIG. 1 showing a conventional configuration.

[Explanation of symbols]

11 is a rotary compressor, 12 is a condenser, 1
3 is a muffler, 14 is a dryer, 15 is a capillary tube (throttle device), 16 is an evaporator, and 17 is a connecting pipe.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Yoshitake Noda 1-6 Ota Toshiba-cho, Ibaraki-shi, Osaka Inside the Toshiba Osaka Plant (72) Inventor Makoto Oikawa 1-6 Ota-Toshiba-cho, Ibaraki-shi, Osaka Issue Toshiba Abu E Co., Ltd. Osaka Office

Claims (1)

[Claims] 1. A compressor, a condenser, a muffler,
A dryer, a throttle device and an evaporator which are connected in sequence, wherein the muffler and the dryer are arranged side by side and the lower part of the muffler and the upper part of the dryer are connected by a connection pipe, and the refrigerant from the condenser is supplied to the muffler from the upper part thereof. A refrigeration cycle characterized in that the refrigerant is supplied from the lower part of the muffler to the drier via the connection pipe from the upper part thereof to the expansion device from the lower part of the drier.